root@NAS:~ # zdb
nas_pool:
    version: 5000
    name: 'nas_pool'
    state: 0
    txg: 15863179
    pool_guid: 8864619166620872156
    errata: 0
    hostid: 1229643686
    hostname: 'NAS'
    com.delphix:has_per_vdev_zaps
    vdev_children: 1
    vdev_tree:
        type: 'root'
        id: 0
        guid: 8864619166620872156
        create_txg: 4
        children[0]:
            type: 'raidz'
            id: 0
            guid: 57248501214257434
            nparity: 1
            metaslab_array: 128
            metaslab_shift: 34
            ashift: 12
            asize: 4000795590656
            is_log: 0
            create_txg: 4
            com.delphix:vdev_zap_top: 65
            children[0]:
                type: 'disk'
                id: 0
                guid: 12976521921426195365
                path: '/dev/gpt/WD_BLUE_WCC6Y3LKA9YS'
                whole_disk: 1
                DTL: 20567
                create_txg: 4
                com.delphix:vdev_zap_leaf: 20565
            children[1]:
                type: 'disk'
                id: 1
                guid: 7375516819440344597
                path: '/dev/gpt/WD_BLUE_WCC3F5646375'
                whole_disk: 1
                DTL: 21095
                create_txg: 4
                com.delphix:vdev_zap_leaf: 67
            children[2]:
                type: 'disk'
                id: 2
                guid: 14808181442305959208
                path: '/dev/gpt/TOSHIBA_ACA100_69B5N62NS'
                whole_disk: 1
                DTL: 21094
                create_txg: 4
                com.delphix:vdev_zap_leaf: 68
            children[3]:
                type: 'disk'
                id: 3
                guid: 4252631183588266894
                path: '/dev/gpt/TOSHIBA_HDWH110_18K96AXNS'
                whole_disk: 1
                DTL: 21093
                create_txg: 4
                com.delphix:vdev_zap_leaf: 69
    features_for_read:
        com.delphix:hole_birth
        com.delphix:embedded_data
system:
    version: 5000
    name: 'system'
    state: 0
    txg: 16407730
    pool_guid: 18378120902235485168
    errata: 0
    hostname: ''
    com.delphix:has_per_vdev_zaps
    vdev_children: 1
    vdev_tree:
        type: 'root'
        id: 0
        guid: 18378120902235485168
        create_txg: 4
        children[0]:
            type: 'disk'
            id: 0
            guid: 8510313443781539880
            path: '/dev/ada2p3'
            whole_disk: 1
            metaslab_array: 128
            metaslab_shift: 30
            ashift: 12
            asize: 115731857408
            is_log: 0
            DTL: 583
            create_txg: 4
            com.delphix:vdev_zap_leaf: 65
            com.delphix:vdev_zap_top: 66
    features_for_read:
        com.delphix:hole_birth
        com.delphix:embedded_data